package cn.tedu.v3_1;

import java.io.*;
import java.net.*;
import java.util.*;

/**
 * Server 端---流置空   升级  JavaOOP
 */

public class Server {
    private ServerSocket serverSocket;

    //优化1.端口号提前：私有属性
    private static final Integer PORT=0202;


    public Server(){
        try {
            serverSocket=new ServerSocket(0202);
        } catch (BindException e){
            System.out.println("请检查端口号，被占用~");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    public void start() {

        try {
            while(true) {
                System.out.println("等待客户端连接");
               Socket socket = serverSocket.accept();


                new Thread(new ClientHandler(socket)).start();
            }
        } catch (IOException e) {
            System.out.println("客户端链接断开链接~");
        } finally {
            if(serverSocket!=null&&!serverSocket.isClosed()){
                try {
                    serverSocket.close();
                } catch (IOException e) {
                    System.out.println("服务器关闭失败~~~");
                }
                System.out.println("服务器关闭成功~~Over");
            }
        }
    }

    public static void main(String[] args){
        new Server().start();
    }
//ClientHandler 多线程类：控制用户端发来的通讯消息
    private class ClientHandler implements Runnable {
        private Socket socket;
        private String ip;
        //Server   ---CS类    ---输入  输出  流 关闭
        // Client  ---start() ---输入  输出  流 关闭
        private PrintWriter pw;
        private BufferedReader br;

        public ClientHandler(Socket s) {
            //1.明确 接入客户端 通讯类 Socket
            this.socket = s;
            //2.给明确接入客户端，IP地址
            ip = socket.getInetAddress().getHostAddress();
            //3.给明确接入客户端，读写功能
            try {
                 br = new BufferedReader(new InputStreamReader(socket.getInputStream(), "UTF8"));
                pw=new PrintWriter(new BufferedWriter(new OutputStreamWriter(socket.getOutputStream(),"UTF8")),true);
            } catch (IOException e) {
                System.out.println("客户端断开链接了~");
            }
        }

        public void run() {
            try {
                new Thread(()->{
                    try {
                        String message;
                        while ((message=br.readLine())!=null) {
                            System.out.println(ip+"客户端说：" + message);

                            System.out.print("服务器请输入：");
                        }
                    } catch (IOException e) {
                        System.out.println("客户端发来的消息断开了~");
                    }
                }).start();

                Scanner input=new Scanner(System.in);
                while(true){
                    System.out.println("服务器请输入：");
                    String sme=input.nextLine();
                    pw.println("服务器说："+sme);
                }
            }  finally {
              if (br != null)
                    try {
                        br.close();
                    } catch (IOException e) {
                        System.out.println("读入流断开链接~");
                    }

             if(pw!=null)
                     pw.close();
                if(socket!=null&&!socket.isClosed()){
                    System.out.println(ip+"客户端退出服务器链接~");
                    try {
                        socket.close();
                    } catch (IOException e) {
                        System.out.println(ip+"客户端退出链接异常~");
                    }
                }
            }
        }
    }
}

